videobokeh function ,its input is the source video and the depth map， output is the videobokeh

import cv2
import numpy as np
from matplotlib import pyplot as plt
import math

def videoBokeh(source_video, depth_map):
    cap = cv2.VideoCapture(source_video)
    if (cap.isOpened()== False): 
      print("Error opening video stream or file")

    frame_width = int(cap.get(3))
    frame_height = int(cap.get(4))
    length = int(cap.get(cv2.CAP_PROP_FRAME_COUNT))
    fps = cap.get(cv2.CAP_PROP_FPS)
    #fourcc = cv2.VideoWriter_fourcc(*'XVID')
    out = cv2.VideoWriter('bokeh_result.avi',cv2.VideoWriter_fourcc('M','J','P','G'), fps, (frame_width,frame_height))
    print(frame_width)
    print(frame_height)
    
    for k in range(0,length-1